I tried that but no use, I am not able to identify, where the focus is going after username, after pressing tab 3 times then only am able to focus into password field. Also may I know how can I set autofocus to username field ?

I attached the zip folder which is having 3 files view1.html, FeedViewer1.js FeedPanel1.js could you please check by placing examples/feedviewer folder. Just try for navigation from username to password field using tab.